Bree dips a pair of prongs onto a water surface and produces waves. When she dips more frequently the resulting waves
A) have shorter wavelengths.
B) remain the same in wavelength.
C) have longer wavelengths.
D) move faster.
E) none of the above
Answer: A
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According to your textbook, popular confusion is lessened when applying Heisenberg's uncertainty principle by heeding the distinction between
A) momentum and energy. B) energy and time. C) passive observation and probing.
The radio lobes that are on each side of some radio galaxies and jets from them produce mainly
a. 21-cm radiation. b. synchrotron radiation. c. black body radiation. d. emission lies due to hydrogen. e. absorption lines due to hydrogen.
When a gas in a container is squeezed to half its volume at constant temperature, the gas pressure
A) is half. B) doubles. C) quadruples. D) remains the same.
A 300-N sled is pulled up a 28° slope at a constant speed by a force of 250 N. What is the coefficient of kinetic friction between sled and slope?
a. 0.21 b. 0.41 c. 0.11 d. 1.55 e. 2.95